The Grand Canyon's outstanding beauty has certainly stood the test of time - and now it has emerged that time is actually 65 million years older than previously thought. Researchers say it was carved some 70 million years ago - at a time when dinosaurs still roamed the Earth.
Most previous estimates have put its age at 5 million to 6 million years, based on the age of gravel washed downstream by the ancestral Colorado River. But now a team from the University of Colorado Boulder, who used radioactive decay and thermal dating to make their estimate, say the Grand Canyon is much, much older.
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